YEAY, Reachoutrescue! Congratulations! I hope you get your 501C-3 (or however it's punctuated) soon! I volunteer to buy a brick for the RB kitties in my family. The athletic booster club at the high school in my district did a Buy a Brick fund-raiser for a new concession stand at the football field. That was my first experience with it. Here's another example, Habitat for Humanity... http://www.habitat.org/gvdc/buy_a_brick.aspx
I Google searched "buy a brick" and in the first couple pages of results there were two different animal-related organizations, one in the US and one in England.